In Exercises, find (a) The mean of the distribution, (b) The standard deviation of the distribution, and

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In Exercises, find 

(a) The mean of the distribution, 

(b) The standard deviation of the distribution, and 

(c) The probability that the random variable is between the mean and 1 standard deviation above the mean.

The length of time (in years) that a seedling tree survives is a random variable t with probability density function defined by ƒ(t) = 0.05e-0.05t for t in [0, ∞).

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